package com.zzyl.framework.interceptor;

import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import com.zzyl.common.exception.base.BaseException;
import com.zzyl.common.utils.UserThreadLocal;
import com.zzyl.framework.web.service.TokenService;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 定义Member拦截器
 * @author YH
 */
@Component
public class MemberInterceptor implements HandlerInterceptor {

    @Autowired
    private TokenService tokenService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception{
        //1.从请求头中获取token
        String token = request.getHeader("authorization");
        //2.判断token是否为空， 空则返回401,重新登录
        if (StrUtil.isEmpty(token)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new BaseException("请重新登录");
        }
        //3.解析token，解析不通过，返回401
        Claims claims = tokenService.parseToken(token);
        if (ObjectUtil.isEmpty(claims)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new BaseException("认证失败");
        }
        //4.从token中获取用户ID，如果为空，返回401
        Long userId = MapUtil.get(claims, "userId", Long.class);
        if (ObjectUtil.isEmpty(userId)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new BaseException("认证失败");
        }

        //5.将用户id存入ThreadLocal
        UserThreadLocal.set(userId);
        //6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserThreadLocal.remove();
    }
}
